Sawing-machine.



Patented Nov. 1918.

V2 SHEETSr-SHEET In".- a,

B. GREEN.

SAWING MACHINE.

APPLICATION FILED 3.9, 1917.

R. GREEN. s'AwmG MACHINE.

APPLICATION FILED fEB- 9,1911.

Patented Nov. 5, 1918.

2 SHEETS-SHEET 2.

ROY GREEN, or BODCAW, ARKANSAS.

' SAWING-MACHINE.

Specification of Ietters Patent.

Patented Nov. 5, 1918.-

Application filed February 9, 1917. Serial N 0. 147,685.

To all whom it may concern;

.Be it known that I, ROY GREEN, a citizen of the United States, residing at Bodcaw, in the county of Nevada and State of Arkansas, have invented certain new and useful Improvements in Sawing-Machines, of which the following is a specification.

V This invention has relation to wood sawing machinery, and the nature and objects thereof will be readily apparent to those skilled in the art to which it appertains in the light of the following explanation of the accompanying drawings illustrating what I now believe to be the preferred embodiment, or mechanical expression of my invention, from among other forms and arrangements within the spirit thereof or the scope of the appended claims.

A However, an object of the invention is to embody in a log sawing machine of this type including a log supporting carriage movable by a-piston reciprocable in a steam cylinder, of means readily operable by the sawyer or others to cut ofi the steam supply to the cylinders in an emergency to immediately stop the operation of the sawing machinery.

Another object of the invention is to provide an apparatus ofthis character adapted to positively cut off the steam supply to the cylinder regardless of position of the sawyers valves. which control admission of steam to the cylinder.

A still further object of the invention, is to provide means for locking the mechanism of my'invention when the same has been actuated in an emergency, thereby prevent+ ing further operation of the wood sawing machinery, until-various adjustments .in the emergency machinery have been made.

In addition to the foregoing my invention comprehends improvements the details of construction and arrangement of parts to be hereinafter more fully described and par- 45 ticularly set forth in the appended claims.

In the accompanying drawings in which similar and corresponding parts are designated by the same characters of reference throughout the several views in which they appear:

Figure 1, is a view in side elevation with parts in section of a log sawing machine illustrating the embodiment therein of my invention.

Fig. 2, is a vertical transverse section taken on the line 22 of the preceding figure. 7 V

Fig. 3, is a horizontal section taken on the line 33 of Fig. 1.

' Fig. 4, is a detail vertical section taken on the line 44 of Fig. 1, and V n Fig. 5, is a detail view. A

In Fig. 1 of the .drawings I haveillustrated portions of a log sawing machine for the purpose of illustrating the manner in which my invention cooperates therewith, and all unnecessary details of the machine have been omitted. With reference to Fig. 1, 10 indicates a carriage adapted to support a log which is indicated at 11. The carriage after the usual manner is supported in a horizontal position for reciprocation upon rails 12, and the carriage, at its'forward end is provided with a depending lug 13 to which the forward end of a piston rod 14 is secured. Located beneath the carriage and disposed in parallelism therewith is a rela-' tively long steam cylinder within which the piston rod 14 extends. The piston rod is provided within the cylinder with a piston 16, and the cylinder is provided at opposite ends with inlet ports 17 utilizable also as exhaust ports. a i

Sawyers valves 18 are located beneath the cylinder 15 adjacenteach end thereof,

and each cylinder is provided with a port 19 placed in communication with the inlet port 17 of the cylinder through the medium of short sections of pipe 20. Eachsawyers valve is furthermore provided at its side opposite the port 19 with inlets and exhaust ports 21 and 22 respectively. Each sawyers valve is of a hollow construction to permit the reciprocation therein of a piston valve 23, which piston valves are adapted for movement in unison through the medium of a rod 24. The piston 23 at the forward end of the cylinder is likewise provided with a rodL 24 which extends to a point adjacent the saw 26 of the sawing machinery and is pivotally connected to a bell crank 27 to which bell crank the lower end of the sawyers lever 28 is pivotally connected.

cated in one direction or the other thereby alternately establishing communication between the supply ports 21 ,of the valves and the inlet ports 19 thereof, or between the inlet ports 19 and the exhaust ports 22 of said valves. In this manner, the steam may be admitted into either end of the steam cylinder, so as to move the piston 16 from one end to the opposite end and back again to thereby move the carriage and thereby bring the log into engagement with the saw, and to move the log away from the saw previous to adjusting the same laterally for sawing another plank. The foregoing description is that of a standard type of log sawlng machine, and hence I do not claim any .of the mechanism embodied therein, but

claim as my invention the mechanism to be hereinafter described.

Each supply port 21 of the sawyers valve 18 is in communication with a supply pipe 31 and in each of said pipes there is interposed an emergency valve indicated generally at Each of said valves is substantially cylindrical in configuration preferably disposed in a horizontal. frame and in alinement, and each formed with a longitudinal central. bore A valve 3% is movable in each .of said bores and each valve is formed upon its forward end with a conical valve portion Each valve is formed with a pair of opposed ports 36 in communication with the supply pipes 31 and a valve seat of conical formation indicated at 37 is formed at the forward end of each of said valve casings. It will be obvious from the foregoing that when the valves 3& are disposed with their conical portions 35 in engagement with the seats 37 the body portion of the valve will be interposed between the ports 36 of the valve thereby cutting off any communication between the opposite sections of the pipe 31 and thereby preventing any admission of steam to the sawyers valve. Normally however, the valves 3% are disposed out of engagement with their seats and therefore the continuity of the pipe 31 is uninterrupted whereby steam may be admitted to the sawyers valves at all times.

Each valve casing 32 is provided upon its under side with a transversely and vertically extending opening which extends through the wall of the valve and intersects the central bore 33, for the purpose of guiding for movement therein a pin 38 to the lower end of which is pivotally connected a lever 39 fulcrumed at an intermediate point as indicated at -10 upon a bracket 41 mounted upon the supply pipe 31. The opposite end of the lever 39 is provided with a Weight 42 whereby to urge the pin 38 in an upward direction. The upper end of the pin 38 normally bears against the body portion of the valve 3 1 except when said valve is moved to closed position whereupon the pin is urged upward and the rear end of the valve is moved forward and unlaps the opening through which the pin 38 projects. In this event the pin 38 is moved upward and bears against the rear end of the valve thereby preventing any backward movement of said valve and retains the same locked to its seat.

The rearward emergency cylinder 32 is' formed upon its forwardend with a pair of horizontal extending more or less curved spaced arms 4L3 which are connected at their extremities by a horizontal shaft 45 and at a point intermediate their length by a shaft to. Said shaft 15 supports a pair of spaced levers 17 adapted normally to hang at their lower ends in front of a trip plate 18 which is adjustably secured to a rod 19, which connects the valves 34 for reciprocation in unison, a rod 50 being connected to the forward end of the valve in the forward casing 32. These rods in each instance extend through suitable packing glands in the valve casings to prevent the escape of steam therefrom. Mounted upon the above mentioned shaft 16 which connects the arms i3, are a pair of bell cranks 51 having one of their arms extending upwardly and connected to the upper ends of the above mentioned levers 47 through the medium of links 52, while the oppositely extending arms of the bell cranks 51 are provided with depending terminals 53 for the purpose of engaging in front of a retaining plate 54 which is secured to the rod d9 at a point just behind the trip plate 48. Extending forwardly from the rear emergency valve are a pair of rods 55 disposed parallel to the rod 49, at opposite sides thereof and in horizontal alinement therewith. Said rods also extend through openings in the retaining plate 5 1 and springs 56 are encircled about each of said rods and interposed between said retaining plate 5% and the valve casing 32 whereby to urge the plate and consequently the rod 49 to which it is secured in a forward direction. It is to be noted however, that the springs are held under tension by the engagement of the terminals 53 of the bell cranks 51 with the said retaining plate.

Located at opposite sides of the sawyers lever 28 and in the path of movement thereof are a pair of arms 57 fixedly mounted, and extended in upwardly diverging relation as indicated in Fig. 2. Each arm 57 is provided upon its outer face with ears 58 adapted to form fulcrum points for verti cally extending levers 59 having at their upper ends set screws 60 whose threaded shanks extend through openings in the arms 57 whereby the sawyers lever may engage during oscillation one or the other of the set screws to rock the levers 59 upon which they are mounted. A bar 61 is extended transversely of the sawing machinery and in a horizontal position .with one end disposed beneath the sawyers lever in close proximity thereto and the other end disposed adjacent the outer extremity of the-emergency "valve rod 50. The lower ends of the above mentioned levers 59 are each pivotally connected to depending links 62 which in turn are each connected to a separate bell crank 63,*said links being connected to the horizontally disposed arms of said bell cranks, the vertical arms of said bell cranks being in turn pivotally connected to the transverse bar 61. The opposite end of the bar 61 is pivotally con.- nected to a'longitudinally extending horizontal arm 64 rigidly connected at its opposite end to a vertical shaft 65 mounted for rotation in suitable bearings, the lower end of said shaft having rigidly secured thereto one end of a transversely extending horizontal arm 66, the opposite end of which is pivotally connected to the emergency valve rod 50. The valve rod 50 is extended beyond this point of connection, and the extremity thereof is connected to the vertical arm of a bell crank 67, the horizontal arm of which,

supports an adjustable weight 68 Owing to this arrangement it will be obvious that a strain is constantly placed upon the emergency valve rod to insure the movement of the valves toward a closed position. The end of the bar 61 remote from the point of connection thereof to the arm 64 is provided with a weighted bell crank 69 similar to the bell crank 67 whereby movement longitudinally of said bar in one direction is urged.

yers lever 28 is moved in either direction to 7 an extreme position, or until one or the other of the set screws 60 are engaged, the lever 59 supporting the engaged set screw will be rocked whereby the corresponding bell crank 63 will be similarly rocked to move the bar 61 longitudinally and in a direction toward the sawyers lever thereby rocking the vertical shaft 65 owing to the connection of its arm 64 with the bar whereby the emergency valve rod 50 will be drawn forward. The rod 49 connecting the emergency valves will be moved in the same direction as the rod 50 and to the same extent thereby oscillating the levers 47 owing to the engagement thereof with the trip plates 48 which is mounted upon the rod 49. The bell cranks 51 will therefore be oscillated owing to the connection thereof with the .said levers-47 the rod 49 is actuated. I t v I It will be'obvious by depressing any one 7 of the above mentioned foot petals 70 the whereupon the downwardly extending ter minals 53 of said bell cranks will be'dis engaged from the retaining plate 54. l/Vhen the retaining plate '54 is thus disengaged the rod 49 may be further moved forward thereby carrying the emergency valves 34 to their seats and permitting the pin 38 to be'disi posedbehind said valves and thereby locking'them in place.

In order that sufficient movement of' the tripplate 48 maybe permitted before the down-turned ends 53 ofthe bell cranks 51 are' entirely disengaged from the retaining plate,

the rod 49 may be provided with an elon gated opening 71 in which the end ofJaset screw 72 projects, said set screw being 'threadedly' engaged in a hub 7 3 formed on gated opening 71 of the rod 49. Thus, a sufiicient forward motion of the rod 49 is permitted equal to the length of the slot 71 in the set screw in the'forward end of the elonorder to permit the retaining plate to become fully engaged. 'Thus it will'be seen that owing to the provision of this improved mechanism, the valves 34 are held in an unseated position at all times and cannot be moved toward a. seated position except through actuation of the rods 49 and 50 in one direction. Furthermore, the valves can 1 I be locked against movement absolutely by releasing the set screw which bindsthe plate 48 to the rod 49'ancl moving said plate toward.

the left which will prevent disengagement of the levers 51 from their plates '54 even when bar 61 will be moved to move the emergency valves to their seats in the manner described above. In this manner should an accident occur to the sawing machinery while no oneis stationednearthe sawyersv lever, the machinery may be stopped at points remote from the lever. The wood sawing machinery is also rendered safe against operation by an irresponsible or inexperienced sawyer as should the sawyers lever be moved too far in either direction a stoppage of the wood sawing machinery will obviously occur.

WVhile I have illustrated and described my invention with some degree of particularity, I realize that in practice various alterations thereover may be made, and I therefore reserve the right and privilege of changing the form of the details of construction or otherwise altering the arrange- V ment of the correlated parts without departing from the spirit of the invention or the scope of the appended claims.

Having thus described my invention what I claim as new and desire to secure by Letters Patent, is

l. In a log sawing machine including a log carriage, a cylinder and piston for moving said carriage, sawyers valves for eontrolling admission of steam to the cylinder, and a lever mechanism for operating said valves, the combination therewith of an emergency valve for each sawyers valve to cut off the steam supply thereto, means engageable by the sawyers valve when moved to an extreme position to close said emergency valves and foot pedals located at various points about the sawing machine for operating said valve operating means.

2. In a. log sawing machine, including a log carriage, a cylinder and piston for moving said carriage, sawyers valves for controlling admission to the steam cylinder, and a lever mechanism for operating said valves, the combination therewith of a valve for cutting ofi steam. supply to said sawyers valve and means operable by an 8X treme movement of the sawyers lever for closing said out off valve.

3v In a log sawing machine, including a log carriage, a cylinder and piston for moving said carriage, sawyers valves for controlling admission of steam to the cylinder, and a sawyers lever mechanism for operat-. ing the said valves, the combination therewith of an emergency valve for each sawyers valve for cutting off the supply of steam thereto, a rod connecting the emergency valves for operation in unison, and. means operable by an extreme movement of the sawyers lever for closing theemergency valves.

l. In a log sawing machine including a log carriage, cylinder and pistons lor moving said carriage, sawyers valves and lever mechanism for operating the valves, the combination therewith of an emergency valve for each of said sawyers valves, a rod connecting the valves to insure movement thereof in unison a rod for actuating the valve, locking means tending to prevent movement of the valves in one direction, and means operable instantly upon movement of the valves to release said locking means, said releasing means being shiitable to a position out of operative relation with the locking means to insure the locking of the valves against movement in one direction.

The combination with a log sawing machine, of an emergency valve for c0ntrolling the admission of steam thereto, a rod for actuating the valve, a collar carried by the rod, a locking pawl engaging the collar to prevent motion of the rod in one direction, a pawl operatively connected with the locking pawl to release the same, and a slidable collar on the rod engaging the operating pawl to release the locking pawl immediately upon movement of the rod, said sliding collar being movable to position out of engagement with the operating pawl whereby to insure locking of the rod against movement in one direction.

In testimony whereof I aflix my signature in presence of two witnesses.

ROY GREEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

